GB2368548A - Die-casting - Google Patents
Die-casting Download PDFInfo
- Publication number
- GB2368548A GB2368548A GB0026480A GB0026480A GB2368548A GB 2368548 A GB2368548 A GB 2368548A GB 0026480 A GB0026480 A GB 0026480A GB 0026480 A GB0026480 A GB 0026480A GB 2368548 A GB2368548 A GB 2368548A
- Authority
- GB
- United Kingdom
- Prior art keywords
- injection
- die
- injection stroke
- casting material
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
An apparatus 1 for die-casting in which a fluid casting material 20 such as a molten metal is injected into a die 27, according to one aspect, comprises a plunger 9 adapted to perform an injection stroke which injects a volume of the fluid casting material into the die and a controller 3 for controlling the injection stroke of the plunger in accordance with an injection stroke program. The controller has a processor unit 29 adapted to process signals received from a sensing arrangement 31 of the apparatus which are representative of one or more parameters of the injection stroke made by the plunger to determine whether the volume of fluid casting material injected into the die is within predetermined limits. In a modification the die-casting apparatus has (i) means 35 for measuring the level of fluid casting material in a container and/or (ii) remote access means through which a computer which controls the apparatus is able to be controlled remotely. In addition a method of die-casting in which fluid casting material is injected into a die with a predetermined injection pressure profile is disclosed.
Description
APPARATUS AND METHOD FOR DIE-CASTING
The present invention relates to an apparatus and method for die-casting in which a fluid casting material, ordinarily a molten metal such as zinc, aluminium or magnesium, is injected into a die.
In a typical die-casting apparatus the molten metal is contained in a melting pot which is in fluid communication with the die through a goose neck. The apparatus is provided with a hydraulically-operated injection plunger which has a stroke which causes molten metal to be injected from the melting pot into the die.
In order to produce die-castings with superior surface finish, the injection plunger has to move at very high speed to force the molten metal into the die during the die-casting operation. As an example, the injection plunger in a typical apparatus may have a design speed of 8 m/s with an injection stroke of 200 mm. This means that an injection time of just over 25 ms is available for filling up the die cavity. In conventional die-casting it is very difficult, if not impossible, to control such a high speed movement of the injection plunger.
If the motion of the injection plunger is not controlled accurately, the amount of molten metal injected into the die cavity has large variations. Since molten metal is virtually incompressible, the volume of the finished casting is directly proportional to the injection volume, any differences being due to thermal expansion.
As most conventional die-casting apparatuses cannot control the injection volume accurately, the volume of the individual castings produced is invariably too small or too large. When the injection volume is too small (referred to as a"short shot") an incomplete casting is formed which must either be scrapped or melted for re-use. This results in low production yield and high energy wastage. When the injection volume is too large, an excess amount of molten material overflows the die cavity and forms a flash surrounding the parting line of the die-casting. In this case, the die-casting is referred to as a"flashed die-casting"and the flash needs to be removed, either manually with hand tools or mechanically. This again results in lower productivity, high material wastage and higher
energy consumption. In order to ensure that short shots do not occur, it is often necessary for conventional die-casting apparatuses to be set such that flashed die-castings result. With these problems in mind, there is made known in US-A-5586435 (Servo Kinetics) a die-casting apparatus having a dual-acting hydraulic cylinder which effects the injection stroke of an injection plunger. The stroke of the injection plunger is controlled by the rate of release of the hydraulic fluid through an outlet port of the cylinder, which rate of flow is governed by a servo valve. To effect a controlled injection stroke of the injection plunger, signals representing the position and velocity of the injection plunger during an injection stroke are fed to a computer closed loop control. In response to the position and velocity signals, the computer closed loop control transmits a command signal to the servo valve to increase or decrease the flow of hydraulic fluid from the outlet port of the hydraulic cylinder. The use of the servo valve enables the command signal to be effected swiftly enough for the speed of the injection plunger to be controlled during the injection stroke.
That is to say, the servo valve acts swiftly enough in response to the command signal to change the rate of hydraulic flow through the outlet port of the hydraulic cylinder during the injection stroke.
Improvements can still be made to die-casting apparatuses to control the accuracy of the volume of the molten metal injected into the die so as to produce flashless castings. Diecasting apparatuses can also be improved in other respects.
According to a first aspect of the present invention there is provided a die-casting apparatus for injecting a fluid casting material into a die comprising a plunger adapted to perform an injection stroke which injects a volume of the fluid casting material into the die and a controller for controlling the injection stroke of the plunger in accordance with an injection stroke program, the controller having a processor unit adapted to process signals received from a sensing arrangement of the apparatus which are representative of one or more parameters of the injection stroke made by the plunger to determine whether the volume of fluid casting material injected into the die is within predetermined limits. Based on this determination, the injection stroke program for the next injection stroke can be adjusted to achieve an injection volume within the predetermined limits, i. e. a volume which produces neither a short shot nor a flashed casting.
The controller may be adapted to generate a fault signal in response to the signal processing determining that the volume of fluid casting material injected into the die is outside the predetermined limits. This may result in an error display on a display unit of the apparatus. The necessary adjustment may then be inputted to the controller by an operator through a peripheral unit, e. g. a keyboard. More preferably, however, the controller is responsive to the fault signal to control the next injection stroke of the plunger in accordance with a compensated injection stroke program to produce a more accurate volume of fluid casting material injected into the die.
According to a second aspect of the invention there is provided a die-casting apparatus for subjecting a container of a fluid casting material to a series of injection cycles in which fluid casting material from the container is injected into a die, the apparatus comprising a plunger for producing in each injection cycle an injection stroke which injects a volume of the fluid casting material into the die, a controller for controlling the injection stroke of the plunger in each cycle in accordance with an injection stroke program and a sensing arrangement adapted in use to transmit to the controller signals representative of the level of the fluid casting material in the container, the controller having a processor unit which is adapted to process the signals received from the sensing arrangement to determine whether the injection stroke needs to be controlled by the controller in accordance with a modified injection stroke program to compensate for a change in the level of the fluid casting material in the container.
According to a third aspect of the invention there is provided a method of die-casting comprising the steps of providing a source of a fluid casting material, providing a die and placing it in fluid communication with the source of fluid casting material, providing a plunger, effecting an injection stroke on the source of fluid casting material with the plunger, the injection stroke being conducted in accordance with an injection stroke program, determining a parameter of the injection stroke which is indicative of the volume of the fluid casting material injected into the die by the injection stroke, comparing the parameter of the injection stroke with a stored value for the parameter which achieves a desired volume of the fluid casting material in the die and correcting the injection stroke
program for the next injection stroke of the plunger if the measured value of the parameter of the injection stroke is outside of predetermined limits of the stored value. According to a fourth aspect of the invention there is provided a method of die-casting comprising the steps of providing a container which contains a fluid casting material, providing a die and placing it in fluid communication with the fluid casting material in the container, providing a plunger, effecting an injection stroke on the source of fluid casting material with the plunger, the injection stroke being conducted in accordance with an injection stroke program, measuring the level of the fluid casting material in the container and compensating the injection stroke program in response to changes in the level of the fluid casting material in the container which will alter the volume of fluid casting material injected into the die.
According to a fifth aspect of the present invention there is provided a method of diecasting in which a fluid casting material in fluid communication with a die is subjected to an injection cycle in which an injection pressure is applied to the fluid casting material which results in the fluid casting material being injected into the die, the injection cycle having a primary stage in which the fluid casting material is subjected to injection pressures in a first range, an intermediate stage in which the fluid casting material is subjected to injection pressures in a second range substantially less than the injection pressures in the first range and a terminal stage in which the fluid casting material is subjected to an injection pressure greater than the injection pressures in the second range.
According to a sixth aspect of the invention there is provided a computer-controlled diecasting apparatus which is provided with remote access means through which the computer is able to be controlled remotely to rectify faults in the apparatus. Preferably, the remote access means is an interface which enables the computer of the apparatus to be in two-way data communication with a computer located remote from the apparatus, more preferably an internet interface.
Other preferred features of the invention according to its various aspects are set out in the appended claims.
By way of example, an embodiment of the invention will now be described with reference to the accompanying Figures of drawings in which :
Figure 1 is a schematic view of a die-casting apparatus including a hydraulically-operated injection system and a computer control system therefor;
Figure 2 is a schematic view of the hydraulically-operated injection system;
Figure 3 is a graph showing an injection pressure and speed profile of a conventional diecasting apparatus; and
Figure 4 is a graph showing an injection pressure and speed profile produced by the diecasting apparatus.
In Figures 1 and 2 of the drawings there is shown a die-casting apparatus 1 in accordance with the present invention having a real-time, multi-stage closed loop control system 3 and an injection system 5 comprising a dual-acting hydraulic injection cylinder 7 which is controlled by the closed loop control system 3 to achieve accurate injection pressure and speed during an injection cycle, as will be described more fully hereinafter.
As shown in Figure 2, the injection system has a piston rod 9 mounted in the injection cylinder 7 for axial displacement thereof. The piston rod 9 has a compression piston 11 at its rear end mounted in the injection cylinder 7 and a plunger 13 at its forward end disposed outside of the injection cylinder 7.
As will be understood by reference to Figures 1 and 2, hydraulic fluid in a hydraulic accumulator 15 is able to enter the rear part of the injection cylinder 7 rearward of the compression piston 11 when an injection valve 17 is opened under control of the control system 3 and hydraulic fluid contained in the forward part of the injection cylinder 7 forward of the compression piston 11 is able to exit the injection cylinder 7 when a dynamic servo valve 19 is opened under control of the control system 3. Thus, when the injection valve 17 and the servo valve 19 are opened, the respective flow of the hydraulic
fluid causes the piston rod 9 to be displaced forwardly and the plunger 13 to inject molten metal 20 contained in a melting pot 23 through a goose neck or nozzle 25 into a die 27. By controlling the opening of the injection valve 17 and the servo valve 19, the control system 3 is able to control the injection stroke of the piston rod 9. In this connection, the hydraulic servo valve 19 has a very fast response time of 4 ms, which is almost real-time compared to a 20 ms response time for a normal hydraulic valve. The use of the"realtime"responsive servo valve 19 alongside the real-time, multi-stage closed loop control system 3 means that an accurate injection pressure and speed profile can be obtained with the piston rod 9. The importance of such control will now be described with reference to
Figures 3 and 4.
In Figure 3 there is shown an injection pressure trace 22 of a conventional die-casting machine. It can be seen that the injection pressure remains at a high value during the whole injection stroke. Near the end of the stroke, there is also a sudden rise 24 in pressure which causes flashing to be formed around the parting line of the die.
Comparison of Figure 3 with Figure 4 shows that an injection pressure trace 26 produced by the die-casting apparatus 1 in accordance with the present invention has a reduced injection pressure 28 near the middle of the injection stroke of the piston rod 9 which increases at a point 30 near the end of the stroke to push just the correct amount of molten metal 20 into the die cavity, thus resulting in a flashless die-casting. Moreover, having improved injection pressure control allows the peak injection pressure to be controlled to finer specific limits. This means that the maximum loading on major structural members, such as the toggle clamping system, the tie-bars and the platens (not shown), can be controlled within finer limits and thereby designed with smaller safety factors. This reduces the over-design associated with conventional die-casting machines and leads to considerable savings in materials and manufacturing costs.
The operation of the injection system 5 of the die-casting apparatus 1 under the control of the real-time, multi-stage closed loop control system 3 will now be explained in greater detail with reference to Figures 1 and 4. Before the first injection stroke of the piston rod 9, an operator manually inputs into the control system 3 the data needed for a computer 29
(programmable logic controller) of the control system 3 to control the injection strokes of the piston rod 9 so that an accurate volume of molten metal 20 is injected into the die 27. Such data is inputted into the control system 3 as set points 50 through a keyboard or other input peripheral device (not shown). Examples of the data inputted are the injection pressure to be applied by the piston rod 9 during the injection strokes, the velocity required of the piston rod 9 during the injection strokes, the starting height level of the molten metal 20 in the melting pot 23, the temperature of the cavity in the die 27 and the volume and mass of the molten metal 20 to be injected into the die 27.
The position of the piston rod 9 is then verified to be at the top or zero position by a transducer 31, e. g. a potentiometer. If the piston rod 9 is not at the top position, then an alarm will sound so that the operator can check to find out what the problem is. Otherwise, a signal 40 is transmitted by the computer 29 to the injection valve 17 which causes the injection valve 17 to open.
After the injection valve 17 has been opened, the computer 29 sends a command signal 32 to control and open the dynamic servo valve 19. As mentioned previously, this causes the piston rod 9 to fall and the injection stroke to commence. The position of the piston rod 9 during the injection stroke is constantly monitored by the transducer 31 and a feedback signal 34 representative of the position of the piston rod 9 fed back to the computer 29.
In this first stage of injection, the piston rod 9 falls at relatively slow speed to expel the air trapped in the die cavity. When the piston rod 9 reaches a predetermined position, e. g. 10 mm down, the computer 29 sends a command signal 32 to the dynamic servo valve 19 to open further at a predetermined speed and to a predetermined extent of opening. This results in a second stage of injection in which the piston rod 9 falls with increased speed.
There may be several subsequent stages of injection depending on the product requirement.
Irrespective of the number of'intermediate'injection stages, in a last stage of injection the piston rod 9 reaches a stop position stored as a set point in a memory of the control system 3. When this stop position is reached by the piston rod 9, the computer 29 sends a command signal 32 to close the dynamic servo valve 19 at a predetermined speed. As a result of the closure of the dynamic servo valve 19, the piston rod 9 stops falling.
Transducer signals 34 representative of the position of the stopped piston rod 9 are fed to the computer 29.
During the injection stroke of the piston rod 9, the computer 29 of the control system 3 uses the input signals fed to it by the sensing arrangements to generate command signals 32 to control the injection stroke in accordance with the injection stroke program formulated from the set points 50.
The control system 3 includes a timing mechanism (not shown) which measures the time taken by the piston rod 9 to reach the stop position from the start position. The computer 29 is programmed so as to calculate the velocity of the piston rod 9 during the injection stroke from the position signals 34 of the transducer 31 and the injection stroke time measured by the timing mechanism. The computer 29 is also fed signals representative of the hydraulic pressures respectively at the rear and forward parts of the injection cylinder 7 by pressure sensors (not shown). The computer 29 is equipped to use this data to plot the pressure and velocity for the injection stroke against time, e. g. as shown in Figures 3 and 4.
The computer 29 is programmed such that, after each injection stroke, the results of these calculations are analysed by the computer 29 vis- -vis the corresponding set point values inputted by the operator. If this analysis indicates that the injection stroke has led to an imperfectly formed cast product, the computer 29 is programmed to automatically adjust the injection stroke program for the next injection stroke to compensate for the inaccuracies in the volume of the molten metal 20 injected into the die 27 in the preceding injection stroke. This means adjusting the injection pressure and the size and speed of opening of the servo valve 19 thereby giving the next shot a different velocity and/or stop position for the piston rod 9.
At the end of each injection stroke the injection valve 17 is closed and the piston rod 9 moved back to the top position to prepare for the next injection stroke.
As well as controlling the injection stroke, the control system 3 also controls the temperature in the die 27. This is important as the die temperature affects the surface finish of the die-casting as well as other properties. To this end, the temperature in the die 27 is
monitored by a thermocouple 33 and signals 50 representative of the temperature are fed to the computer 29. If the die temperature is less than that inputted by the operator as the required temperature for the particular product being produced (e. g. 150 C), then the die 27 is heated by a heater (not shown) under control of the computer 29. Alternately, if the die temperature is higher than that required it is cooled, e. g. by water, to reach the required temperature before the next injection cycle starts.
The die-casting apparatus 1 also includes a gauge 35 to monitor the height level of the molten metal 20 in the melting pot 23 and feed signals 36 representative of the height level to the computer 29. The molten metal height level determines the first stage injection distance which is used to expel the air trapped in the die cavity. Based on the feedback to the computer 29, the computer 29 is programmed to automatically adjust the first stage injection distance for the next injection stroke to an appropriate distance to account for the drop in the molten metal height level which occurs after the preceding injection stroke.
It can thus be seen that the die-casting apparatus I is provided with means for enabling high quality, high efficiency flashless casting to be produced.
In addition, the die-casting apparatus 1 also comprises the following further advantageous features: 'The die-casting apparatus 1 has a self-diagnostic function built-into the control system
3 through which faults in the apparatus 1 are able to be detected and displayed on a display unit (not shown) together with the remedial action needed to be carried out.
* The die-casting apparatus 1 has a built-in interface through which various parameters relating to the operation of the apparatus I can be transmitted from a sensing arrangement of the apparatus through a phone line, a wireless transmitter/receiver (e. g. a radio frequency modem) or the internet to a complementary receiver/transmitter means connected to a remotely-located computer, e. g. at a remote technical support centre. When production difficulties are encountered which cannot be solved on-site by the operator, even with the help of the self-diagnostic function, service engineers can remotely log onto the computer 29 of the control system 3 and access the data stored
thereon to find out the problem and, where possible, transmit data to the computer 29 to reset the apparatus operation control parameters to solve the production problem.
That is to say, on-line diagnosis of the apparatus 1 can be conducted.
Within the control system 3 there is built-in a production management system alongside the self diagnostic functions and related apparatus operation parameters. The operator can therefore use the built-in production management system to carry out production control and management operations and achieve an efficient computer integrated manufacturing operation.
Suitable hardware and software for the self-diagnostic functions and the remote access diagnostic capability is available from Barber-Colman Company, e. g. MACO 4000,5000 and 6000 controllers and MACO VIEW remote diagnostics software.
It will be understood by the skilled reader in the art that the invention is not limited to the specific example described with reference to the Figures of drawings but can be modified and varied in many ways within the scope of the appended claims.
Claims (26)
1. A die-casting apparatus for injecting a fluid casting material into a die comprising a plunger adapted to perform an injection stroke which injects a volume of the fluid casting material into the die and a controller for controlling the injection stroke of the plunger in accordance with an injection stroke program characterised in that the controller has a processor unit adapted to process signals received from a sensing arrangement of the apparatus which are representative of one or more parameters of the injection stroke made by the plunger to determine whether the volume of fluid casting material injected into the die is within predetermined limits.
2. A die-casting apparatus according to claim 1, characterised in that the controller is adapted to generate a fault signal in response to the signal processing determining that the volume of fluid casting material injected into the die is outside the predetermined limits.
3. A die-casting apparatus according to claim 2, characterised in that the controller is responsive to the fault signal to control the next injection stroke of the plunger in accordance with a compensated injection stroke program to produce a more accurate volume of fluid casting material injected into the die.
4. A die-casting apparatus according to any one of claims 1 to 3, characterised in that the sensing arrangement comprises one or more sensors adapted in use to transmit to the controller signals which are representative of the position of the plunger during the injection stroke.
5. A die-casting apparatus according to any one of claims 1 to 4, characterised in that the sensing arrangement comprises one or more sensors adapted in use to transmit to the controller signals which are representative of the injection pressure applied by the plunger during the injection stroke.
6. A die-casting apparatus according to claim 4 when appended to claim 2 or claim 3, characterised in that the controller comprises a timing mechanism adapted to transmit to the processor unit timing signals during the injection stroke, the processor unit is adapted
to calculate the velocity profile of the plunger during the injection stroke based on the timing and position signals, the controller comprises a memory in which is stored a velocity profile for the plunger to effect injection of a volume of the fluid casting material into the die within the predetermined limits and the processor unit is adapted to compare the calculated velocity profile and the stored velocity profile whereby the fault signal is generated in response to the calculated velocity profile being outside of predetermined limits of the stored velocity profile.
7. A die-casting apparatus according to claim 5 when appended to claim 2 or claim 3, characterised in that the controller comprises a timing mechanism adapted to transmit to the processor unit timing signals during the injection stroke, the processor unit is adapted to calculate the injection pressure profile of the plunger during the injection stroke based on the timing and injection pressure signals, the controller comprises a memory in which is stored an injection pressure profile for the plunger to effect injection of a volume of the fluid casting material into the die within the predetermined limits and the processor unit is adapted to compare the calculated and stored injection pressure profiles whereby the fault signal is generated in response to the calculated injection pressure profile being outside of predetermined limits of the stored injection pressure profile.
8. A die-casting apparatus according to claim 5 when appendant to claim 4, characterised in that the controller comprises a timing mechanism adapted to transmit to the processor unit timing signals during the injection stroke, the processor unit is adapted to calculate the velocity and injection pressure profiles of the plunger during the injection stroke based on the timing, position and injection pressure signals, the controller comprises a memory in which are stored velocity and injection pressure profiles for the plunger to effect injection of a volume of the fluid casting material into the die within the predetermined limits and the processor unit is adapted to compare the calculated and stored velocity and injection pressure profiles whereby a fault signal is generated in response to at least one of the calculated velocity and injection pressure profiles being outside of predetermined limits of the corresponding stored profile.
9. A die-casting apparatus for subjecting a container of a fluid casting material to a series of injection cycles in which fluid casting material from the container is injected into a die, the apparatus comprising a plunger for producing in each injection cycle an injection stroke which injects a volume of the fluid casting material into the die and a controller for controlling the injection stroke of the plunger in each cycle in accordance with an injection stroke program characterised in that the apparatus further comprises a sensing arrangement adapted in use to transmit to the controller signals representative of the level of the fluid casting material in the container and the controller has a processor unit which is adapted to process the signals received from the sensing arrangement to determine whether the injection stroke needs to be controlled by the controller in accordance with a modified injection stroke program to compensate for a change in the level of the fluid casting material in the container.
10. A die-casting apparatus according to claim 9, characterised in that the controller is adapted to generate a fault signal in response to the signal processing determining that a modified injection stroke program is needed.
11. A die-casting apparatus according to claim 10, characterised in that the controller is responsive to the fault signal to control the next injection stroke of the plunger in accordance with the modified injection stroke program.
12. A die-casting apparatus according to any one of the preceding claims, characterised in that the apparatus further comprises a hydraulic system having a servo valve for effecting the injection stroke of the plunger and the controller is adapted to transmit control signals to the servo valve which result in the hydraulic system effecting the injection stroke of the plunger in accordance with the injection stroke program.
13. A die-casting apparatus according to claim 12 when appended to claim 5, claim 7 or claim 8, characterised in that the sensing arrangement transmits signals representative of the hydraulic pressure acting on the plunger during the injection stroke.
14. A method of die-casting comprising the steps of providing a source of a fluid casting material, providing a die and placing it in fluid communication with the source of fluid casting material, providing a plunger, effecting an injection stroke on the source of fluid casting material with the plunger, the injection stroke being conducted in accordance with an injection stroke program, determining a parameter of the injection stroke which is indicative of the volume of the fluid casting material injected into the die by the injection stroke, comparing the parameter of the injection stroke with a stored value for the parameter which achieves a desired volume of the fluid casting material in the die and correcting the injection stroke program for the next injection stroke of the plunger if the measured value of the parameter of the injection stroke is outside of predetermined limits of the stored value.
15. A method according to claim 14, characterised in that the velocity profile of the injection stroke is determined and compared with a stored velocity profile.
16. A method according to claim 14 or 15, characterised in that the injection pressure profile of the injection stroke is determined and compared with a stored injection pressure profile.
17. A method of die-casting comprising the steps of providing a container which contains a fluid casting material, providing a die and placing it in fluid communication with the fluid casting material in the container, providing a plunger, effecting an injection stroke on the source of fluid casting material with the plunger, the injection stroke being conducted in accordance with an injection stroke program, measuring the level of the fluid casting material in the container and compensating the injection stroke program in response to changes in the level of the fluid casting material in the container which will alter the volume of fluid casting material injected into the die.
18. A method of die-casting in which a fluid casting material in fluid communication
with a die is subjected to an injection cycle in which an injection pressure is applied to the i fluid casting material which results in the fluid casting material being injected into the die characterised in that in a primary stage of the injection cycle the fluid casting material is subjected to injection pressures in a first range, in an intermediate stage of the injection
cycle the fluid casting material is subjected to injection pressures in a second range substantially less than the injection pressures in the first range, and in a terminal stage of the injection cycle the fluid casting material is subjected to an injection pressure greater than the injection pressures in the second range.
19. A method according to claim 18, characterised in that the injection pressures in the second range are less than 50% of the injection pressures in the first range.
20. A method according to claim 18 or 19, characterised in that the injection pressure in the terminal stage is less than the injection pressures in the first range.
21. A method according to claim 18, 19 or 20, characterised in that the injection pressure in the terminal stage is nearer in value to the injection pressures in the first range than the injection pressures in the second range.
22. A computer-controlled die-casting apparatus characterised by the provision of remote access means through which the computer is able to be controlled remotely to rectify faults in the apparatus.
23. A die-casting apparatus according to claim 22, characterised in that the remote access means is an interface which enables the computer of the apparatus to be in two-way data communication with a computer located remote from the apparatus.
24. A die-casting apparatus according to claim 23, characterised in that the interface is an internet interface.
25. A die-casting apparatus substantially as hereinbefore described with reference to, and as illustrated in, Figures 1, 2 and 4 of the accompanying drawings.
26. A method of die-casting substantially as hereinbefore described with reference to, and as illustrated in, Figures 1, 2 and 4 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0026480A GB2368548A (en) | 2000-10-30 | 2000-10-30 | Die-casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0026480A GB2368548A (en) | 2000-10-30 | 2000-10-30 | Die-casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0026480D0 GB0026480D0 (en) | 2000-12-13 |
| GB2368548A true GB2368548A (en) | 2002-05-08 |
Family
ID=9902187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0026480A Withdrawn GB2368548A (en) | 2000-10-30 | 2000-10-30 | Die-casting |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2368548A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814372B (en) * | 2021-10-15 | 2022-12-06 | 常州艾可特机电科技有限公司 | Vacuum die-casting control method, system and equipment |
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| US5770808A (en) * | 1996-03-29 | 1998-06-23 | Toshiba Kikai Kabushiki Kaisha | Product quality determining methods for die cast machines |
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| US5957192A (en) * | 1997-11-27 | 1999-09-28 | Toshiba Kikai Kabushiki Kaisha | Method for controlling injection in a die casting machine and apparatus for the same |
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2000
- 2000-10-30 GB GB0026480A patent/GB2368548A/en not_active Withdrawn
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|---|---|---|---|---|
| US3767339A (en) * | 1971-11-01 | 1973-10-23 | Hunkar Instr Dev Labor Inc | Injection molding control |
| US4559991A (en) * | 1982-06-03 | 1985-12-24 | Toshiba Kikai Kabushiki Kaisha | Method and system of controlling injection molding machines |
| EP0126174A1 (en) * | 1983-05-20 | 1984-11-28 | John Mickowski | Process for monitoring and controlling intermittently working molding and casting devices and apparatus for performing said process |
| US5022457A (en) * | 1988-01-30 | 1991-06-11 | Toshiba Machine Co., Ltd. | Casting control system of die cast machine |
| US5207267A (en) * | 1990-08-09 | 1993-05-04 | Toshiba Kikai Kabushiki Kaisha | Injection control method of die cast machine |
| EP0481413A1 (en) * | 1990-10-15 | 1992-04-22 | Nippondenso Co., Ltd. | Method of discriminating quality of die-cast article and die-casting process using same |
| US5359531A (en) * | 1991-01-09 | 1994-10-25 | Toshiba Kikai Kabushiki Kaisha | Method of and apparatus for displaying casting-data in die-cast machine |
| US5455773A (en) * | 1993-03-31 | 1995-10-03 | Maschinenfabrik Muller-Weingarten Ag | Method for the determination of optimum parameters for a casting process, particularly on die-casting machines |
| US5586435A (en) * | 1993-07-20 | 1996-12-24 | Servo Kinetics | Hydraulic closed loop control system |
| US5870305A (en) * | 1996-03-25 | 1999-02-09 | Toshiba Kikai Kabushiki Kaisha | Control method for die cast machine |
| US5770808A (en) * | 1996-03-29 | 1998-06-23 | Toshiba Kikai Kabushiki Kaisha | Product quality determining methods for die cast machines |
| US5859777A (en) * | 1996-05-14 | 1999-01-12 | Toshiba Kikai Kabushiki Kaisha | Casting control support system for die casting machines |
| US5957192A (en) * | 1997-11-27 | 1999-09-28 | Toshiba Kikai Kabushiki Kaisha | Method for controlling injection in a die casting machine and apparatus for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0026480D0 (en) | 2000-12-13 |
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